Calfax Data Brain II Handheld Electronic Calculator

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This handheld electronic calculator has a mustard- and olive-colored plastic case and an array of twenty square plastic keys. These include ten digit keys, a clear/clear entry key, a decimal point key, a total key, four arithmetic function keys, a percentage key, a memory key, and a recall memory/cancel memory key. The on/off switch is on the right side above the keyboard. A mark left of this reads: data brain II. Behind is an eight-digit LED display.
A power jack is along the back edge of the calculator. A sticker on the back gives operating instructions. It reads in part: MANUFACTURED IN HONG KONG BY (/) AMERICAN IMPORT MERCHANTS CORPORATION (/) CALFAX DIVISION. Below this is a compartment for a nine-volt battery. A sticker below this reads: Serial No. 143893.
Ball and Flamm give a date of about 1974 for this calculator.
Reference: Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 43.
Currently not on view
date made
ca 1974
place made
Zhonghua: Hong Kong
Physical Description
plastic (case; keys material)
metal (circuitry material)
paper (stickers material)
overall: 1 1/2 in x 3 in x 5 3/8 in; 3.81 cm x 7.62 cm x 13.6525 cm
ID Number
catalog number
accession number
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History


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